Skeleton's arm goes into body when shooting arrows

The bug

The Skeletons arm goes into his body when shooting arrows. It might be harder to see in the latest versions but can still be reproduced rather easily when the skeleton is riding another entity.

How to reproduce

1. Summon a skeleton which is riding another entity

   /summon armor_stand ~ ~ ~ {Invulnerable:1b,Passengers:[{id:"skeleton",HandItems:[{id:"bow",Count:1b}]}]}
   

2. Switch to Survival mode and move very close to the skeleton around it